File and attachment therefor



I Jan. 16, 1940. L. STARK 2,186,997

FILE AND ATTACHMENT THEREFOR Filed May 17, 1958 INVENTO'R laws .STfl/PK ATT NEYS Patented Jan. 16, 1940 mm orbits FILE AND ATTACHMENT THEREFOR Louis Stark, Brooklyn, N. Y., assignor to Kastar, 1 Incorporated, New York, N. Y., a corporation of New York Application May 17, 1938, Serial No. 208,383

7 Claims.

The invention relates to a file adapted particularly for filing the coacting faces of theconta-ct or breakerpoints of an automobile engine distri-bmor. More particularly, the invention relates to an attachmentfor such a file which is so constructed and disposed in cooperative relation with the file that the latter may be used with facility tohold the file with the abrading surfaces thereof in the correct position for efiecting the required it operation of filing the contact'suriaces and to prevent the file from slipping outof such position While in use.

An important object of the invention is to pro vide an attachment'ior a file adapted for the indicated use whichwil-l guide the movement of the file for the required limited extent, and which attachment, after the limited abrading surface being utilized has been worn, permits a readjustment of the attachment to another position for making possible'the use of adjacent portions of the abradi-ng file surface, the worn part being broken off and discarded. By the use of my novel attachment, therefore, the entire length of the file, i. -e., substantially all of the abrading surfaces thereof, may be utilized beforethe entire file must be discarded.

The contact or breaker points of an automobile engine distributor, after extended running of the engine, become pitted, resulting in sticking of 39 the contacts or breaker points, or the development of uneven coacting surfaces, localizing the spar-k and interfering with the smooth operation of the distributor and therefore of the engine. In order to overcome these defects, it is necessary periodically to ahrade the coacting faces of the contact or breaker points so as to impart to them smooth and even surfaces and thereby again secure the proper timing and correct sparking. In order to accomplish these results, the abradin-g surface so must be moved along the coasting faces only a few times and the f le must be held in proper position so as not to slip out from betweenthe breaker points in the course of its reciprocal movement therebetween. One ofthe features of my novel attachment contributes in great measure to the proper positioning of the file.

' For accomplishing a further important object of the invention, my novel file attachment is provided with a supporting member for the file which is provided with an elongated slot through which extends the body of a set screw, which at the same time passes through a saddle member encompassing the file, the end of the set screw engaging the body of the file. The reciprocating movement of the file is thus limited by the ends I tion 9.

of the elongated slot,which ends thus act as stops for limiting the movement of the file body within the support. Thus, when the operative end of the abrading surface of the file has-become Worn, the set screw may be released and moved a short distance, usually no greater than approximately of an inch, so as to present a different portion of the abrading surface against the coasting faces of the contact or breaker points to be abraded. the Worn part of the file being then broken ed and discarded. This operation of moving the set screw may thus be periodically performed until the entire length of the file, i. e., the abrading surfaces thereof, have been used. I

A particular embodiment of my invention is illustrated in the accompanying rawing, in

which Fig. l is a plan view of my novel file and attachment therefor; l

Fig. 2 is a side view thereof; T

Fig. 3 is a bottom plan view oithe file andattachment secured thereto;

'Fig. 4. is a section on the line dof Fig. 2; and

Fig.6 is a section on the line 5-5 of Fig. 2;

Referring more particularly to the drawing,

in which similar reference characters identify similar parts in the several views, 6 designates the file member broadly, which has abrading surfaces 1 and 8 and a handle por- The file is positioned within a supporting member generally designated as M), having a forwardly projecting portion H and a rearwardly projecting portion 52, the former being provided with an aperture it, and the latter being pressed upwardly from the body of the 5 support and extending in parallel relation to the file, as indicated in Fig. 2. The supporting member Ill ispro-vided withtwo arcuate sides it l5 straddling the side edges of the file.

The extension it of the supporting member is 0 provided with an elongated slot 56 through which extends a set screw ll, the head it of which may have its peripheral edge knurled and which. head may have a slot it adapted to receive a screw driver.

Below the supporting member extension l2 and straddling the file 6 is a saddle member 26 having a central aperture threaded to receive the set screw H, the saddle being formed with arcuate sides 2i and 22 encompassing the edges of the file. 50

In the utilizationof the file and novel attachment therefor, as her-einab-ove described, the file is positioned so as to have the aperture is be tween the coacting faces of the contact or breaker points of the distributor, one of the breaker point penetrating the aperture l3 so as to have its face in contact with the corresponding abrading s11.- face of the file. The set screw ll having been tightened to have the extremity thereof abut the surface of the file, the file, by means of the handle 8, may be reciprooated within the limits of the length of the slot 15, the ends of the slot acting as stops limiting the movement of the file within the support. It will be understood, of course, that during the abrading operation, the support is stationary and the file reciprocally moved to effect filing or abrading of the coacting faces of the breaker points. When the end of the file has been worn, such worn part (represented by the dotted line extension of the file as shown in Fig. 1) may be broken ofi and discarded, and the set screw released and moved a short distance, usually no more than of an inch, to bring a new portion of the abrading surfaceinto abutting relation with the faces of the contact or breaker points, this operation being repeated until the entire file, i. e., its abrading surfaces, has been utilized.

While I have described a particular embodiment of my invention, it is obvious that various changes therein, particularly in the configuration and disposition of the several parts thereof, may be made without departing from my invention.

I claim:

1. The combination, with a file, of a support therefor having a portion extending in one direction along the abrading surface of the file and provided with an aperture, and another portion extending in the opposite direction longitudinally parallel to the abrading surface of the file, said latter portion having an elongated slot, a saddle member straddling the file, a set screw extending through said elongated slot and through said saddle member for securing said member to the file, whereby the operative portion of the abrading surface of the file, when worn, may be broken off and discarded, and another portion brought into abrading position by movement of the set screw and said saddle member longitudinally of the file.

2. The combination, with a file for abrading the contact points of an internal combustion engine distributor, of a support for said file having an extension at one end and provided with an aperture, the extension having the aperture being adapted for insertion between the contact points of the distributor to hold the file from slipping out when in use, and an extension at the other end and having an elongated slot, a saddle member straddling the file, a set screw extending through said elongated slot and threadedly engaging said saddle member, whereby said support is rendered adjustable by said set screw and saddle member, at any point along the entire length of the file, so that different, successive portions of the abrading surface of the file may be brought into operative position opposite the contacts, successive used portions, when worn, being capable of being broken off and discarded.

3. The combination, with a file for abrading the contact points of an internal combustion engine distributor, of a support for said file comprising a portion having depending arcuate sides straddling the side edges of the file, and a portion, having an elongated slot, extending parallel to, and above, the abrading surface of the file, a set screw extending through said elongated slot and engaging the file surface, and a saddle member having depending arcuate sides straddling the file and engaged by said set screw, whereby the movement of said file within the support is limited by the ends of the elongated slot.

4. The combination, with a file for abrading the contact points of an internal combustion engine distributor, of a support for said file comprising a portion having depending arcuate sides straddling the side edges of the file, a portion extending along the abrading surface of the file and provided with an aperture, and a raised portion, having an elongated slot, extending along the abrading surface of the file on the opposite side of said first portion, a set screw extending through said elongated slot and engaging the file surface, and a saddle member having depending arcuate sides straddling the file and engaged by said set screw, whereby the movement of said file within the support is limited by the ends of the elongated slot.

5. An attachment for a file for abrading the contact points of an internal combustion engine distributor, comprising a body portion having depending arcuate sides to straddle the side edges of the file, a portion extending from said body portion in one direction, provided with an aperture, a raised portion, having an elongated slot, extending from said body portion in the opposite direction, a set screw extending through said elongated slot, and a saddle member below said slot and engaged by said set screw.

6. The combination, with a file for abrading the contact points of an internal combustion engine distributor, of a support for said file, having a portion extending longitudinally along the abrading surface of the file, said portion having an elongated slot, a member movable along said file, and a set screw extending through said elongated slot and through said member for fixing the position of said member upon the file, whereby the movement of said file within the supporting member is limited by the ends of the elongated slot.

'7. The combination, with a file for abrading the contact points of an internal combustion engine distributor, of an apertured support for said file, said support having a portion extending longitudinally along the abrading surface of the file, said portion having an elongated slot, a member movable along said file, and a set screw extending through said elongated slot and through said member for fixing the position of said member upon the file, whereby the move ment of said file within the support is limited by the ends of the elongated slot.

LOUIS STARK. 

